Perspective aid device



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Nov, 8, 1949 Patented Nov. 8, 1949 UNITED STATES PATENT GFFICE PERSPECTIVE AID DEVICE Goss K. Black and Willard S. B'osley, Indianapolis, Intl.`

Application January 24, 1947, Serial No. 724,210'

(Cl. .t-26)' 7 Claims. l

This invention relates to a perspective aid device.

The chief object -of this invention is to provi-de guide lines for the draftsman or artist to aid and assist in the creation of a true angular perspective image or representation.

The chief feature of the present invention` resides in the provision ofA an adjustable length horizon line, in lineal perspective drawing, having two vanishing points in that line, the distance between said points determining the length of that line and the resulting perspective utilized for the drawing to be made.

Another feature of the invention resides in its extreme simplicity in production and use as set forth herein.

Other objects and features of the invention will be more fully mentioned and described in the description to follow.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

In the drawings- Fig. 1 is a perspective View of a base structure with one set of guide lines thereon, herein shown as applied to a movable transparent or translu cent element.

Fig. 2 is a similar View of a translucent or transparent element for use with the parts shown in Fig. 1.

Fig. 3 is a plan view of the complete device to which has been applied tracing paper or cloth upon which has been formed a partial perspective image.

Fig. 4 is an enlarged section showing one embodiment of the base.

In Figs. 1, 3 and 4, I 0 indicates a base or board element of any suitable material and provided on two opposite sides with perspective element retainers or rails II. Herein same is shown as a channel with a wider flange I2, a web I3 and a narrow flange I4.

The spacing between flanges is just sufficient to accommodate base I0 and one or two of the guide elements as hereinafter described. The 3v base board is suitably apertured at I5, see Fig. 4, and the ange I2 is similarly apertured and tapped as at I'l to take screws I6. Other forms of channel-base connection may be utilized, that disclosed herein being representative only because the channels shown are duplicates.

Also the embodiment selected for illustration contemplates two drafting guide elements. Herein I 8 indicates the so-called lower element. It is provided with a vanishing point VP1 at one 21 side and a horizontal horizon line HLl intermediate the side edges. This element Iii. includes transverse spaced lines I9 and angle lines 2li spaced from each other and the horizon line and at opposite sidesv thereof asy shown.

The foregoing linesY and vanishing point may be permanently applied to. base I0 whenever desired. However, it is; preferred to utilize a separate element and have same slidable to and from upon the base` for adjusting. the position et point VP1 thereon.

A translucent or transparent sheet 2 I, see Figs. 2 and 3, includes at the opposite end vanishing points VP2 included in intermediate horizon line HL2. This element includes transverse spaced lines 23 and angularly disposed lines 2d. From inspection it will be noted that if the horizon lines are medianly disposed on each element one element is a duplicate of the other although in use, see Fig. 3, same are oppositely disposed. Element 2| also is slidable over element IS and is guided and retained by channels Il.

As illustrated in Fig. 3 the guide lines are adjusted by moving one or both elements until the distance between vanishing points is that desired or required and of course that determines the length of the horizon line for then lines HLl and HL2 coincide or register.

A sheet of tracing material 25 is suitably secured to the exposed face of member as by Scotch tape 26 or the like. Then the image is formed by pencil 21 or like instrument as illustrated in Fig. 3.

All vertical lines of such image are parallel to transverse lines I9 and 23 exposed through sheet 25. The several angle lines 20 and 24 are similarly exposed and the image lines corresponding to the angular perspective are approximately parallel thereto or the horizon line, all as shown.

While the invention has been illustrated and described in great detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character.

The several modications described herein as well as others which will readily suggest themselves to persons skilled in this art, all are considered to be within the broad scope of the invention, reference being had to the appended claims.

The invention claimed is:

1. An adjustable perspective drawing device including in combination two superposed elements, each having parallel spaced lines, a horizon line positioned ntermediately on one of the elements and transverse to all iirst mentioned lines therein, and other lines on the said one element and inclined to the horizon line, the said inclined lines being disposed at opposite sides of the said horizon line and projectively intersecting same at a vanishing point therein, the horizon lines of both elements registering, the vanishing points being disposed oppositely relative to each for common horizon line length determination, the uppermost of said elements at least being translucent for lower element line exposure therethrough, the elements being slidable relative to each other for horizon line length variation.

2. A device as dened by claim 1 wherein both elements are substantially identical, the horizon lines halving the spaced lines.

3. A device as dened by claim 1 wherein the inclined lines depart from the horizon line by progressively increasing angles, the angular increase being substantially equal.

4. A device as defined by claim 1 wherein the inclined lines depart from the horizon line by progressively increasing angles, the angular increase being substantially equal, and both elements are substantially identical, the horizon lines halving the spaced lines. Y

5. A device as dened by claim 1 wherein the lowermost element comprises a base with upper and edge disposed trackways to slidably support the uppermost element.

6. A device as defined by claim 1 wherein the lowermost element comprises a base with upper and edge disposed trackways to slidably support the uppermost element, the lowermost element including a duplicate of the uppermost element in reversed relation and slidable in the trackways, the horizon lines bisecting the parallel lines.

7. A device as defined by claim 1 wherein the lowermost element comprises a base with upper and edge disposed trackways to slidably support the uppermost element, the lowermost element including a duplicate of the uppermost element and disposed in reversed relation thereto and slidable in the trackways, the horizon lines bisecting the parallel lines, the inclined lines departing from the horizon lines by progressively increasing angles, the angular increase being substantially equal.

GOSS K. BLACK. WILLARD S. BOSLEY.

REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Number Country Date 450,388 Great Britain July 16, 1936 

